How to authorize the SMS function of SYNC3 on Apple 6 mobile phone?

Apple's mobile phone comes with SMS function, which can be used normally.

2. When the signal is good and both parties are iPhones, texting does not consume phone bills. At this point, the color of the box sent by SMS is blue.

3. If the other party is not an IPhone, the text message sent is green, which will consume the phone bill.

4. If the signal is not good, the short message in the blue box will be posted, or you can press and hold "Send Short Message".

If you don't like it or it's too much trouble, you can set it to send text messages all the time. Specific steps: Set-SMS-Send as SMS.